/*
 #
 #  Files       : Action.h
 #                ( C++ header file )
 #
 #  Description : The SmallMatrix Library
 #                ( http://code.google.com/p/smallmatrix )
 #
 #  Copyright   : Olivier Juan
 #                ( http://www.mas.ecp.fr/vision/Personnel/juan/ )
 #
 #  License     : CeCILL-C
 #                ( http://www.cecill.info/licences/Licence_CeCILL-C_V1-en.html )
 #
 #  This software is governed by the CeCILL-C license under French law and
 #  abiding by the rules of distribution of free software.  You can  use,
 #  modify and or redistribute the software under the terms of the CeCILL-C
 #  license as circulated by CEA, CNRS and INRIA at the following URL
 #  "http://www.cecill.info".
 #
 #  As a counterpart to the access to the source code and  rights to copy,
 #  modify and redistribute granted by the license, users are provided only
 #  with a limited warranty  and the software's author,  the holder of the
 #  economic rights,  and the successive licensors  have only  limited
 #  liability.
 #
 #  In this respect, the user's attention is drawn to the risks associated
 #  with loading,  using,  modifying and/or developing or reproducing the
 #  software by the user in light of its specific status of free software,
 #  that may mean  that it is complicated to manipulate,  and  that  also
 #  therefore means  that it is reserved for developers  and  experienced
 #  professionals having in-depth computer knowledge. Users are therefore
 #  encouraged to load and test the software's suitability as regards their
 #  requirements in conditions enabling the security of their systems and/or
 #  data to be ensured and,  more generally, to use and operate it in the
 #  same conditions as regards security.
 #
 #  The fact that you are presently reading this means that you have had
 #  knowledge of the CeCILL-C license and that you accept its terms.
 #
*/

#ifndef _ACTION_H
#define _ACTION_H

#include <SmallMatrix/SmallMatrix.h>

NAMESPACE_BEGIN(SmallMatrix)

template <typename T, int IdxR, int IdxC>
struct Shape {
	enum { OK = true };
};
template <int N, int IdxR, int IdxC>
struct Shape<SymMatrix<N>, IdxR, IdxC> {
	enum { OK = IdxR <= IdxC };
};

template <typename T>
struct Action {
	typedef typename T::result_type TT;
	typedef DescriptionTraits<TT> Size;
	enum { ROW = typename Size::ROW };
	enum { COL = typename Size::COL };
	template <int IdxR, int IdxC, bool b = true>
	struct doOne {
		static INLINE void act(T& Expr) {
			Expr.template Access<IdxR, IdxC>();
		}
	};
	template <int IdxR, int IdxC>
	struct doOne<IdxR,IdxC,false> {
		static INLINE void act(T& /*Expr*/) {
		}
	};
	template <int IdxR, int IdxC, int N>
	struct doColumn {
		enum { OK = Shape<TT, IdxR, IdxC>::OK };
		static INLINE void act(T& Expr) {
			doOne<IdxR,IdxC,OK>::act(Expr);
			doColumn<IdxR,IdxC+1,N-1>::act(Expr);
		}
	};
	template <int IdxR, int IdxC>
	struct doColumn<IdxR,IdxC,0> {
		static INLINE void act(T& /*Expr*/) {
		}
	};
	template <int IdxR, int N>
	struct doLine {
		static INLINE void act(T& Expr) {
			doColumn<IdxR, 0, COL>::act(Expr);
			doLine<IdxR+1, N-1>::act(Expr);
		}
	};
	template <int IdxR>
	struct doLine<IdxR, 0> {
		static INLINE void act(T& /*Expr*/) {
		}
	};
	static INLINE void act(T& Expr) {
		doLine<0, ROW>::act(Expr);
	}
};

NAMESPACE_END

#endif
